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FEATURES
High efficiency: 87% @ 1.8V/40A
Standard footprint:
57.9x36.8x10.2mm (2.28”x1.45”x0.40”)
Industry standard pin out
Fixed frequency operation
Wide output trim range: 0.8V~1.9V
Fully protected: OTP, OVP, OCP, UVLO
No minimum load required
Fast transient response
Start up into pre-biased load
Basic insulation
ISO 9000, TL 9000, ISO 14001 certified
manufacturing facility
UL/cUL 60950 (US & Canada) Recognized,
and TUV (EN60950) Certified
CE mark meets 7
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TECHNICAL SPECIFICATIONS (T =25°C, airflow rate=300 LFM, V =48Vdc, nominal Vout unless otherwise noted; mounted on board.) A in PARAMETER NOTES and CONDITIONS Q48SR1R840NR A Min. Typ. Max. Units ABSOLUTE MAXIMUM RATINGS Input Voltage Continuous 80 Vdc Transient (100ms) 100ms 100 Vdc Operating Temperature Refer to Figure 24 for the measuring point -40 114 °C Storage Temperature -55 125 °C Input/Output Isolation Voltage 1 minute 1500 Vdc INPUT CHARACTERISTICS
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ELECTRICAL CHARACTERISTICS CURVES 95 24.0 36Vin 48Vin 75Vin 36Vin 48Vin 75Vin 90 20.0 85 16.0 80 12.0 75 8.0 70 4.0 65 0.0 60 5 10152025303540 5 10152025303540 OUTPUT CURRENT(A) OUTPUT CURRENT (A) Figure 1: Efficiency vs. load current for minimum, nominal, and Figure 2: Power dissipation vs. load current for minimum, maximum input voltage at 25°C. (Vout=1.8V) nominal, and maximum input voltage at 25°C. (Vout=1.8V) 85 14.0 36Vin 48Vin 75Vin 80 12.0 10.0 75 8.0 70 6.0 4.0 65 36Vin 48Vin 75
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ELECTRICAL CHARACTERISTICS CURVES 15.0 95 36Vin 48Vin 75Vin 14.0 93 13.0 91 12.0 89 11.0 87 10.0 85 9.0 83 8.0 81 7.0 79 6.0 36Vin 48Vin 75Vin 77 5.0 75 0.8 1.0 1.2 1.4 1.6 1.8 0.8 1.0 1.2 1.4 1.6 1.8 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) Figure 5: Efficiency vs. output voltage for minimum, nominal, Figure 6: Power dissipation vs. output voltage for minimum, and maximum input voltage at 25°C. (Iout=40A) nominal, and maximum input voltage at 25°C. (Iout=40A) 3.0 Io=40A Io=24A Io=4A 2.5 2.0
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ELECTRICAL CHARACTERISTICS CURVES Figure 9: Turn-on transient at zero load current (5 ms/div). Figure 10: Output voltage response to step-change in load Top Trace: Vout: 1V/div; Bottom Trace: ON/OFF input: current (75%-50%-75% of Io, max; di/dt = 0.1A/µs). Load cap: 2V/div 10µF, tantalum capacitor and 1µF ceramic capacitor. Top Trace: Vout (50mV/div), Bottom Trace: Iout (20A/div). Scope measurement should be made using a BNC cable (length shorter than 20 inches). Position the load betwee
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ELECTRICAL CHARACTERISTICS CURVES Figure 13: Input Terminal Ripple Current, i , at full rated Figure 14: Input reflected ripple current, i , through a 12µH c s output current and nominal input voltage with 12µH source source inductor at nominal input voltage and rated load current impedance and 33µF electrolytic capacitor (500 mA/div). (5 mA/div). Copper Strip Vo(+) SCOPE RESISTIVE 10u 1u LOAD Vo(-) Figure 15: Output voltage noise and ripple measurement Figure 16: Output voltage ripple
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ELECTRICAL CHARACTERISTICS CURVES 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 Vin=48V 0.0 0 102030405060 LOAD CURRENT (A) Figure 17: Output voltage vs. load current showing typical current limit curves and converter shutdown points. 7 OUTPUT VOLTAGE (V)
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DESIGN CONSIDERATIONS Input Source Impedance Do not ground one of the input pins without grounding one of the output pins. This connection may allow a The impedance of the input source connecting to the non-SELV voltage to appear between the output pin DC/DC power modules will interact with the modules and ground. and affect the stability. A low ac-impedance input source is recommended. If the source inductance is The power module has extra-low voltage (ELV) outputs more
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FEATURES DESCRIPTIONS Vi(+) Vo(+) Over-Current Protection The modules include an internal output over-current Sense(+) protection circuit, which will endure current limiting for ON/OFF an unlimited duration during output overload. If the output current exceeds the OCP set point, the modules Sense(-) will automatically shut down (hiccup mode). Vi(-) Vo(-) The modules will try to restart after shutdown. If the overload condition still exists, the module will shut down again
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FEATURES DESCRIPTIONS (CON.) Output Voltage Adjustment (TRIM) To increase or decrease the output voltage set point, connect an external resistor between the TRIM pin and either the SENSE(+) or SENSE(-). The TRIM pin should be left open if this feature is not used. Figure 21: Circuit configuration for trim-down (decrease output voltage) If the external resistor is connected between the TRIM and SENSE (-) the output voltage set point decreases (Fig. 21). The external resist
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THERMAL CONSIDERATIONS THERMAL CURVES Thermal management is an important part of the system design. To ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire temperature range of the module. Convection cooling is usually the dominant mode of heat transfer. Hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel. Thermal Testing Setup Delta’s DC/DC power modules are characterized
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THERMAL CURVES (CON.) Q48SR1R840(Standard) Output Current vs. Ambient Temperature and Air Velocity @ Vin = 48V, Vo = 1.8V (Tranverse Orientation) Output Current(A) 45 40 35 Natural 30 Convection 25 100LFM 200LFM 20 300LFM 15 400LFM 10 500LFM 5 600LFM 0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature ( ) Figure 25: Output current vs. ambient temperature and air velocity (V =48V, V =1.8V, transverse orientation) in out Q48SR1R840(Standard) Output Current vs. Ambient Tempera
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MECHANICAL DRAWING Pin No. Name Function 1 -Vin Negative input voltage 2 ON/OFF Remote ON/OFF 3 +Vin Positive input voltage 4 +Vout Positive output voltage 5 +SENSE Positive remote sense 6 TRIM Output voltage trim 7 -SENSE Negative remote sense 8 -Vout Negative output voltage Notes: 1 Pins 1-3, 5-7 are 1.00mm (0.040”) diameter 2 Pins 4 and 8 are 1.50mm (0.060”) diameter 3 All pins are copper with tin plating 13
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PART NUMBERING SYSTEM The part numbering system for Delta’s Q48SR DC/DC converters have the following format: Q 48 S R 1R8 40 N R A Form Factor Input Number of Product Output Output ON/OFF Pin Space Option Code Voltage Outputs Series Voltage Current Logic Length Q - Quarter 48V S - Single R - Single 1R8 - 1.8V 40 - 40A N - Negative R - 0.170” A - Standard Brick Board P - Positive N - 0.145” Functions K - 0.110” MODEL LIST MODEL NAME INPUT OUTPUT EFF @ 100% LOAD Q48SR1R840NR A 36
